119 lines
2.9 KiB
Groff
119 lines
2.9 KiB
Groff
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ENVIRON(7) Minix Programmer's Manual ENVIRON(7)
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NAME
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environ - user environment
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SYNOPSIS
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extern char *const *environ;
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DESCRIPTION
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An array of strings called the `environment' is made available by
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execve(2) when a process begins. By convention these strings have the
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form `name=value'. The following names are used by various commands:
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PATH The sequence of directory prefixes that sh, time, nice(1), etc.,
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apply in searching for a file known by an incomplete path name.
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The prefixes are separated by `:'. Login shells set
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PATH=:/bin:/usr/bin. Note that the empty space between the `='
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and the `:' indicates the current directory. Security aware
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people move the extra `:' to the end of their path or omit it.
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HOME A user's login directory, set by login(1) from the password file
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passwd(5).
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TERM The kind of terminal for which output is to be prepared. This
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information is used by programs that wish to exploit special
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terminal capabilities, a screen oriented text editor for
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instance. The terminal type is set by login(1) from the tty
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database ttytab(5).
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SHELL The file name of the users login shell, set by login(1) from the
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password file passwd(5).
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TERMCAP The string describing the terminal in TERM, or the name of the
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termcap file, see termcap(5), termcap(3).
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EXINIT A startup list of commands read by elvis(1).
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USER The login name of the user, set by login(1) from the password
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file passwd(5).
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LOGNAME Set to the same value as USER. BSD derived systems have USER,
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System V has LOGNAME, so modern systems have both to avoid
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problems.
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Further names may be placed in the environment by the export command and
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`name=value' arguments in sh(1). Arguments may also be placed in their
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environment by programs if they use putenv(3). Or in the environment of
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another program by building a new environment for one of the exec
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functions that accepts an environment list, like execle(2) or execve(2).
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It is unwise to conflict with certain sh(1) variables that are frequently
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set and/or exported by `.profile' files: MAIL, PS1, PS2, IFS.
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5BSD May 20, 1985 1
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ENVIRON(7) Minix Programmer's Manual ENVIRON(7)
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SEE ALSO
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elvis(1), login(1), sh(1), execl(2), execve(2), system(3), termcap(3),
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termcap(5), ttytab(5).
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5BSD May 20, 1985 2
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